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單項選擇題

A reciprocating air compressor is running roughly and vibrating excessively, indicating that the （）.

A.compressor is overloaded
B.motor is overloaded
C.foundation bolts are loose
D.belts are too tight

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單項選擇題

The term "pour point" is defined as the lowest temperature at which lubricating oils will flow （）.

A.rapidly
B.by gravity
C.through a standard orifice at a specified temperature
D.at a rate of 60cc per second

單項選擇題

When liquid reaches the compressor of a refrigeration system through the suction line, the condition is called （）.

A.flooding back
B.superheating
C.overflowing
D.recycling